如何在C＃中将包含另一个可变大小的对象列表的对象的可变大小的列表绑定到DataGridView

Question

How to bind a variable-size list of objects (here called Record) containing another variable-size list of objects (here called Field) to DataGridView in a way that each the Field object in the inner list bind to a cell (through Value property) and each of the Record object in the outer list bind to a row. The idea is to make a DataGridView dynamically with a variable number of columns based on the number of items in the inner list for each Record object. Here is my code for Record class:

public class Record
    {
        public List<Field> Fields { get; set; }
    }

and the Field class:

public class Field
    {
public String Name { get; set; }        
public String Value { get; set; }        
    }

in the main program I have something like:

    public List<Record> Records{ get; set; }

The Records list get filled programmatically and each Record in the list has the same amount of objects in its Fields list. Now I want to bind this data to a DataGridView in a way that each Record object in the outer list shows as a row in the table where each of its Fields is aa cell in the DataGridView. Is that possible? If so, how can I do it?

Answer 1

You can transform it to list of DataGridViewRow and add those the the DataGridView

First you need to set the columns (this assumes you have a first record at all):

foreach (Field field in this.Records.First().Fields) 
{ 
    dgv.Columns.Add(field.Name, field.Name); 
}

Then using LINQ transform each Record to DataGridViewRow

IEnumerable<DataGridViewRow> rows = this.Records.Select(rec =>
{
    var row = new DataGridViewRow();
    row.SetValues(rec.Fields.Select(field => field.Value));
    return row;
});

And finally load them to the DataGridView :

dgv.Rows.Add(rows);

---

If you want to use DataSource you will have to create a DataTable out of it.
You can create and extension method and use it like this:

dgv.DataSource = this.Records.ToDataTable();

The extension class:

public static class RecordListExtensions
{
    public static DataTable ToDataTable(this List<Record> records)
    {
        DataTable table = new DataTable();
        foreach (var field in records.First().Fields) { table.Columns.Add(field.Name); }

        foreach (var record in records)
        {
            table.Rows.Add(record.Fields.Select(field => field.Value).ToArray());
        }

        return table;
    }
}